NCR RealPOS 72XRT POS User Manual page 74

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• Power Status LED - This White LED is used to illuminate the NCR Logo on the bezel
• LAN Link - This Green LED lights to indicate that the system is attached to a LAN. It
• HDD Activity - This Green LED lights whenever there is activity to the hard drives.
• Diagnostic LEDs (A-F) - These six Red LEDs are used to indicate various failure
• Power On Self Test (POST) Error (A-C): These three LEDS Flash during boot-up. If
BIOS
Checkpoint
• Temperature Warning (D): Lights when temperature threshold is exceeded and CPU
• CPU Voltage Bad (E): Lights if CPU is not receiving adequate power to boot the
• Power Supply Bad (F): Lit when power supply is not providing proper voltage to
to indicate that the system is on. In addition, this LED blinks when the system is in
S3 suspend mode.
stays on whenever the LAN is present, even if the unit is powered off. This LED also
flashes to indicate LAN activity.
modes of the system, primarily when the system fails to boot. These LEDS are
located behind the Front Base Cover, making them visible only when they are lit.
boot fails, different combinations of LEDs indicate the point where POST failed to
aid in troubleshooting.
Description
Normal Operating condition after proper boot
D1 Keyboard Controller BAT test. Check if waking from power
management suspend state. Save power on CPUID value in
scratch CMOS.
D4 Test Base 512kb memory. Adjust policies and cache first
8MB. Set stack. (Indicates Bad DIMM)
04 Verify CMOS and update if necessary. Initialize data
variables. Also indicates that SATA device is not initializing.
(Indicates SATA Failure)
0A Initialize keyboard controller
Indicates that there is no memory detected in system.
is throttling to prevent overheating. System performance may be affected during
throttling.
system (Check power supply and internal connection).
internal connections, including powered serial ports. Isolates failure to internal
power supply. A, D, E, and F LEDs illuminate in this case.
POST Diagnostics
A B C
OFF OFF OFF
OFF OFF ON
OFF ON OFF
OFF ON ON
ON OFF OFF
ON ON ON